using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=\<a.*?www\.)([a-z]+\.[a-z]+)(?:.*?(target.*?\"".*\""))?";
string substitution = @"&$1;";
string input = @"<a href=""https://www.domainurl.com/refer/google-adsense/"">fsdf</a>
<a title=""Google Adsense"" href=""https://www.domainurl.com/refer/google-adsense/"" target=""_blank"" rel=""nofollow noopener"">fgddf</a>
<a href=""https://www.domainurl.com/page/pago"">domain </a>";
RegexOptions options = RegexOptions.Multiline;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx